Pipe-cutter



(No Model.) S I L. KNIGHT PIPE CUTTER. No. 302,145 Patented July 15, 1884.

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UNITED STATES 'PATENT @rrrilh.

LUTHER KNIGHT, OF NEW HAVEN, CONNECTICUT.

PIPE-CUTTER.

IJPECIPICATION forming part of'Letters Patent No. 302,145, dated July 15, 1884.

I Application filed February 4, 1884. (No model.) i

To aZZ who/wait Weary concern..-

My invention further consists in certain de- Be it known that I, LUTHER KNIGHT, retails of construction and combinations of parts,

siding at New Haven, in theoounty of- New Haven and State of Connecticut, have invented certain new and useful Improvements in Pipe-Cutters; and I do declare the following to be a full, clear, and exact description of the same, reference being had to the accompanying drawings, which form a part of this speci fication.

My invention relates to an improvement in' outside pipe-cutters, the object being to produce a convertible cutter of this class for use in situations where it cannot be rotated around the pipe, as well'as in situationswhere it can be so rotated, and to provide such-a cutter with improved means for reducing the burr raised upon the pipe during the operation of cutting it; for beveling the ends of the pipe to facilitate the application of the threading-die;

. for protecting the jaw of the cutter from wear,-

and for attachi'ngthe operating-screw of the cutter to theplunger thereof. A further object of the invention is to provide an improved handle for the operating-screw.

My invention consists in interchangeable blocks, respectively having cutting-edges and bearingfaces, and arranged to co-operate with the cutting device of. a pipe-cutter. r

My invention further consists in a remova= ble block having a bearing-face from which it tapers to its 'outer end, and fitting in a slot handle cast in one piece, andattached to the lower end of the operating-screw, and consisting, essentially, of a bulb provided with two apertures to receive the screw, and of two .beaded truncated cones projecting from opposite faces of the bulb, with their bases outward.

out in the claims.

aswill be hereinafter described, and pointed In the accompanying drawings, Figure 1 is a sidefvi'ew, partly in elevation and partly in section, of a pipe-cutter embodying my invention.

elevation. Fig. 3 is a sectional view looking toward the end of the plunger, from which one hand, in situations where it cannot be rotated around the pipe to be divided, and,

on the other hand, in situations where-it can be so rotated, is effected by means ofinterchangeable blocks, respectively having cutting-edges and bearing-faces, and fitting in a tapering slot, A, extending through the jaw B of the cutter. Three of the forms which .the blocks may assume are shown in the drawings. The block 0 is made of steel,and

provided with a cutting-edge, D, forming a re-entering angle. When the block is in the cutter, the same may be used for dividing aforesaid, its cutting-edge invariably coincides f with the incision made by the cutting-disk E, and insures a neat j ob, and whenever the edge of the block becomes worn the same may either be removed, ground, and replaced'or substituted by another similar block with the same results. When the situation of the pipe will permit,the cutter is preferably rotated around it, as it enables a quicker job to be had. Preferably, also, in rotating a pipe-cutter around a pipe, but one cutter is employed. To meet this demand the blocks F and G are employed to replace the block O, above described. The block F is Fig. 2 is a view thereof in front made of white iron or its equivalent, and provided with a beveled bearing-face, H, which fulfills the twofold function of reducing the burr raised upon the pipe by flattening or upsetting it, and of beveling the ends of the pipe, and thus facilitating the application of the threading-die. The block G is made of the same material as the block F, and provided with a fiat bearing-face, I, which reduces the burr raised upon the pipe, in the same manner as above described, without beveling the ends thereof. When in the slot, the bearing-faces of both of the said blocks F and G stand out a little from the jaw and support the pipe above and protect the jaw from wear. The blocks are introduced into the slot from the inner face of the jaw, and removed by a blow upon their outer ends, which project beyond its outer face, as shown. It is to be noted, in this connection, that the greater the pressure brought to bear upon the blocks the more firmly will they be held in place.

The attachment of the operating-screw J to the plunger K, which is supported and guided by a strap, L, passing around it, and rigidly secured to the shank M of the cutter, is effected by means of a key, N, consisting of a plate of metal having its inner edge cut away, as at O, to fit into a groove, 1?, formed in the upper end of the screw, and located in a slot, Q, extending transversely across the lower end of the plunger. As herein shown, the key is secured in the slot by means of a short screw, R, threadedinto the opposite walls of the slot, which are cut away, as shown at I, for the purpose. It is apparent, however, that other means than thescrew may be employed for holding the key in place.

The improved hollow handle for the operating-screw, which plays in a bearing, J,

formed integral with the shank M of the cutter, consists of a bulb, T, provided with apertures U, to receive the lower extremity of the screw, which is squared, as shown at V, and of two truncated cones, W, cast integral with and projecting from opposite faces of the bulb, with their bases outward, and provided with beads X, which assist the hand in retaining its grasp upon the handle. A handle made as described does not fill up the hands as do the more bulbous handles ordinarily employed, and is very easy to grasp and manipulate.

I would have it understood that I do not limit myself to the exact construction shown and described, but hold myself at liberty to make such changes and alterations as fairly fall within the spirit and scope of my invention.

Having fully described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. A convertible pipe-cutter provided with interchangeable blocks, respectively having cutting-edges and bearing-faces, and arranged to co-operate with the cutting device of the cutter, substantially as set forth.

2. A convertible pipe-cutter provided with interchangeable blocks, respectively having cutting-edges and bearing-faces, fitting in a slot formed in the jaw of the cutter and cooperating with the cutting device of the cutter, substantially as set forth.

3. A convertible pipe-cutter provided with interchangeable blocks, respectively having cutting-edges and bearing-faces, and fitting in and projecting out of a tapering slot formed in the jaw of the cutter, substantially as set forth.

4. Apipe-cutter provided with a removable block having a bearing-face from which it tapers to its outer end, and fitting in a slot formed in the jaw of the cutter, and tapering from the inner to the outer face thereof, substantially as set forth.

5. A pipe-cutter provided with a removable block having a smooth beveled bearing-face, which reduces the burr raised upon the pipe by the cutting device of the cutter, and bevels or points the ends of the pipe, substantially as set forth.

6. In a pipe-cutter, a key consisting of a plate of metal having its inner edge cut away to fit into a groove formed in the upper end of the operating-screw, and located in a slot formed in the plunger, substantially as set forth.

7. In a pipe-cutter, a hollow handle cast in one piece, and consisting of a bulb having two apertures to receive the lower end of the operating-screw, and of two beaded truncated cones projecting from opposite faces of the bulb, with their bases outward, substantially as set forth.

In testimony whereof I have signed this specification in the presenceof two subscribing witnesses.

LUTHER KNIGHT.

\Vituesses:

DAVID Z. Hawkins, EDWARD H. ROGERS. 

